Table of Contents
- 1 Introduction
- 1.1 Question 1: What is Jenkins?
- 1.2 Question 2: Why should developers use Jenkins?
- 1.3 Question 3: What is ‘automated testing’?
- 1.4 Question 4: What is ‘continuous integration’?
- 1.5 Question 5: What do you need to start using Jenkins?
- 1.6 Question 6: What is the default security mechanism for user authentication?
- 1.7 Question 7: Name at least two of the most popular plugins for Jenkins.
- 1.8 Question 8: How do you backup your files?
- 1.9 Question 9: What is a ‘pipeline’?
- 1.10 Question 10: What are the three fundamental stages of a Jenkins pipeline?
- 2 Advanced Jenkins Interview Questions
- 2.1 Question 11: How does Hudson relate to Jenkins?
- 2.2 Question 12: Name two ways of how you could schedule a build.
- 2.3 Question 13: What are some of the most popular environment variables?
- 2.4 Question 14: How would you move a file from one server to the other?
- 2.5 Question 15: Should you use Jenkins together with Selenium?
- 2.6 Question 16: What are the best ways to make sure that your Jenkins database is secure?
- 2.7 Question 17: What is Ansible?
- 2.8 Question 18: What is an ‘agent’?
- 2.9 Question 19: What is a ‘Jenkinsfile’?
- 2.10 Question 20: What is the command to manually start Jenkins?
- 3 General Tips
- 4 Conclusions
IntroductionLet us not waste any time and start with the most basic Jenkins interview questions that you might get asked during your job interview. The questions being “basic” does not mean that they’re not important, though – if you flunk these, you’re probably not really going to make it to the more advanced ones, anyway. So, pay close attention and memorize – let’s take it from the top.
Question 1: What is Jenkins?To put it very simply, Jenkins is an open-source, continuous integration-focused, Java-based automation server. Basically, if you’re a developer who is constantly creating new programs and various software, yet you’re not using Jenkins – you’re missing out big time. Jenkins allows developers to test their programs on the go, all while allowing to integrate upgrades and additional features through ought the process.
Question 2: Why should developers use Jenkins?As one of the introductory interview questions on Jenkins, your potential employers might want to check what you deem to be as the most important features of Jenkins. Even though the answer seems to be very subjective, here are a few examples that you can consider:
- Easy to catch bugs early on;
- An automated testing process;
- Continuous integration.
Question 3: What is ‘automated testing’?This is one of those interview questions on Jenkins that you should really remember!
Question 4: What is ‘continuous integration’?Another popular concept, especially if the job that you’re preparing for with these Jenkins interview questions is somehow related with the DevOps philosophy. Continuous integration is a process when multiple tests are performed on a single project on a daily basis. This is done because there’s usually way more than one developer working on the project (program, app, etc.).
Question 5: What do you need to start using Jenkins?There are two basic requirements to start using Jenkins – a viable source code repository and a build script that’s registered on that repository. However, there are also two software requirements before you actually install Jenkins – Java Development Kit and Jakarta: Enterprise Edition.
Question 6: What is the default security mechanism for user authentication?Although at first glance this might seem like one of the more advanced Jenkins interview questions, it’s actually pretty simple when you think about it.
Question 7: Name at least two of the most popular plugins for Jenkins.Maven and Git are probably two of the most popular Jenkins plugins to date.
Question 8: How do you backup your files?This is probably one of the few self-explanatory Jenkins interview questions that you might get. The JENKINS-HOME directory contains all of your personal configurations. This means that the only thing that you need to do to keep your files safe and clean from any issues is to back up the directory.
Question 9: What is a ‘pipeline’?The term “pipeline” is used to describe the process from a project earliest development stages all the way to its release to the public.
Question 10: What are the three fundamental stages of a Jenkins pipeline?Build the project, test the project and then deploy the project.
Advanced Jenkins Interview QuestionsThose were ten examples of what a typical beginning of your Jenkins job interview could look like. As you probably noticed, the questions are quite simple – they’re designed to check your general knowledge about Jenkins, automation, DevOps and so on. Now that you can kind of know what to expect, we can transition to Jenkins interview questions and answers for experienced developers and programmers. These questions and answers are designed to check just how in-depth does your knowledge on the topic goes. Also, when it comes to these interview questions on Jenkins, they aren’t all necessarily super difficult – they’re simply much more technical.
Question 11: How does Hudson relate to Jenkins?
Question 12: Name two ways of how you could schedule a build.You could either issue commits to the management of the source code or, if you wished, you could manually request the builds.
Question 13: What are some of the most popular environment variables?This type of Jenkins interview questions could be somewhat tricky to figure out, for employers might purposely try to make the questions much more difficult than they have to be. Keeping in mind that question most likely relates to Jenkins build jobs, there are a lot of elemental variables that you could choose from. Here are a few of the more well-known ones:
Question 14: How would you move a file from one server to the other?This is considered to be one of the advanced Jenkins interview questions mainly because there can be quite a few possible answers to it. However, if you want to keep it as simple as possible (which is quite advisable), there’s a very straightforward answer – simply copy the job directory and paste it in the other server.
Question 15: Should you use Jenkins together with Selenium?Yes, it’s actually quite beneficial – this type of a combination runs immediate tests every single time that your program changes or alters in some way.
Question 16: What are the best ways to make sure that your Jenkins database is secure?There are plenty of ways to ensure security is of the top level when it comes Jenkins, but some of the more notable ones include (but are not limited to) keeping global security on, running security checks, keeping your database protected on the physical level (not letting unauthorized personnel near it), etc.
Question 17: What is Ansible?
Question 18: What is an ‘agent’?An “agent” can be seen as a point of reference – it specifies a point in the pipeline in which Jenkins will be launched.
Question 19: What is a ‘Jenkinsfile’?It is a text file containing all of the information about the project’s pipeline. It should always be implemented into the source control.
Question 20: What is the command to manually start Jenkins?